At least 145 people in 17 U.S. states have fallen ill in a new cyclospora outbreak, with illnesses starting between May 1 and June 6 and 20 patients hospitalized.
New York has the largest reported cluster with 31 to 80 cases, Illinois has 11 to 30, and the other 15 affected states have 1 to 10 each.
CDC said all patients who were interviewed ate food in the United States and reported no foreign travel in the 14 days before becoming sick, pointing investigators toward a domestic food source.
No specific contaminated item has been identified yet, though local, state and federal officials are investigating multistate clusters during cyclospora's usual May-through-August season.
The agency said the true case count is likely higher because some infected people do not seek care or get tested; a Michigan county had separately reported multiple cyclosporiasis cases earlier Sunday.